Clean up .gitignore file

.gitignore

diff --git a/.gitignore b/.gitignore
index 7089ea7..bd10280 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,38 +1,26 @@
-*.class
+# Maven
+target/
+.flattened-pom.xml
+
+# Eclipse
 .classpath
 .project
+.settings/
+bin/
+bin-test/
 
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
-
-# Package Files #
-*.jar
-*.war
-*.ear
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
-
+# Idea
 .idea
 *.iml
-target
+
+# NetBeans
+nb-configuration.xml
 
 # emacs
 *~
 
-*.class
-*.jar
-target/
-/bin/
-/dist/
-.settings/
-/**/.classpath
-/**/.project
-
-/.project
-nb-configuration.xml
-
 # mac
 .DS_Store
 
-/target-test/
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*